<template>
    <div class="upload-container">
        <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true">
            upload
        </el-button>
        <el-dialog :visible.sync="dialogVisible">
            <el-upload
                :multiple="true"
                :file-list="fileList"
                :show-file-list="true"
                :on-remove="handleRemove"
                :on-success="handleSuccess"
                :before-upload="beforeUpload"
                class="editor-slide-upload"
                action="https://httpbin.org/post"
                list-type="picture-card"
            >
                <el-button  type="primary">
                    Click upload
                </el-button>
            </el-upload>
            <el-button @click="dialogVisible = false">
                Cancel
            </el-button>
            <el-button type="primary" @click="handleSubmit">
                Confirm
            </el-button>
        </el-dialog>
    </div>
</template>

<script>
    // import { getToken } from 'api/qiniu'

    export default {
        name: 'EditorSlideUpload',
        props: {
            color: {
                type: String,
                default: '#1890ff'
            }
        },
        data() {
            return {
                dialogVisible: false,
                listObj: {},
                fileList: []
            }
        },
        methods: {
            checkAllSuccess() {
                return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
            },
            handleSubmit() {
                const arr = Object.keys(this.listObj).map(v => this.listObj[v])
                if (!this.checkAllSuccess()) {
                    this.$message('Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!')
                    return
                }
                this.$emit('successCBK', arr)
                this.listObj = {}
                this.fileList = []
                this.dialogVisible = false
            },
            handleSuccess(response, file) {
                const uid = file.uid
                const objKeyArr = Object.keys(this.listObj)
                for (let i = 0, len = objKeyArr.length; i < len; i++) {
                    if (this.listObj[objKeyArr[i]].uid === uid) {
                        this.listObj[objKeyArr[i]].url = response.files.file
                        this.listObj[objKeyArr[i]].hasSuccess = true
                        return
                    }
                }
            },
            handleRemove(file) {
                const uid = file.uid
                const objKeyArr = Object.keys(this.listObj)
                for (let i = 0, len = objKeyArr.length; i < len; i++) {
                    if (this.listObj[objKeyArr[i]].uid === uid) {
                        delete this.listObj[objKeyArr[i]]
                        return
                    }
                }
            },
            beforeUpload(file) {
                const _self = this
                const _URL = window.URL || window.webkitURL
                const fileName = file.uid
                this.listObj[fileName] = {}
                return new Promise((resolve, reject) => {
                    const img = new Image()
                    img.src = _URL.createObjectURL(file)
                    img.onload = function() {
                        _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height }
                    }
                    resolve(true)
                })
            }
        }
    }
</script>

<style lang="scss" scoped>
    .editor-slide-upload {
        margin-bottom: 20px;
        .el-upload--picture-card {
            width: 100%;
        }
    }
</style>
